CEA 4001 - Page 30

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30

The position

and

type

of

stop

and

check

valves

and

any

pressure

reducing

valve,

water

meter,

water

lock

and

any connection

supplying

water

for

other

services,

shall

be

indicated.

3.4.4.2 Hydraulic calculation

An

hydraulic

calculation

(with

relevant

flow

tests)

shall

show

that

each

trunk

main

together

with

any

branch

main,

from

each

water

supply

to

a

main

installation

control

valve

set

water

supply

test

and

drain

valve

and control

valve

'C'

gauge

(i.e.

including

the

installation

control

valves)

is

capable

of

providing

the

required pressure

and

flow

at

the

installation

control

valve

test

and

drain

valve.

3.4.4.3 Town main

Where

a

town

main

forms

one

or

both

of

the

supplies

or

provides

infill

to

a

reduced

capacity

storage

tank,

the

following

details

shall

be

given:

a)

the

nominal

diameter

of

the

main;

b)

whether

the

main

is

double-end

fed

or

dead-end;

if

dead-end,

the

location

of

the

nearest

double-

end

fed

main

connected

to

it;

c)

the

pressure/flow

characteristic

graph

of

the

town

main

determined

by

a

test

at

a

period

of

peak demand.

At

least

three

test

points

shall

be

shown.

The

graph

shall

be

corrected

for

friction

losses and

static

head

difference

between

the

test

location

and

either

the

control

valve

'C'

gauge

or

the suction

tank

infill

valve,

as

appropriate;

d)

the

date

and

time

of

the

town

main

test;

e)

the

location

of

the

town

main

test

point

relative

to

the

installation

control

valve;

and

where

the

pipework

is

fully

calculated

the

following

additional

details

shall

be

given

f)

a

pressure/flow

characteristic

graph

indicating

the

available

pressure

at

any

flow

up

to

the

maximum flow

demand;

g)

the

demand

pressure/flow

characteristic

graph

for

each

installation

for

the

hydraulically

most

unfavourable

(and

if

required

the

most

favourable)

area

of

operation

with

pressure

taken

as

at

the control

valve

'C'

pressure

gauge.

3.4.4.4 Automatic pump set

Where

automatic

pump

sets

form

one

or

more

of

the

water

supplies

the

following

details

of

each

automatic

pump

set

shall

be

provided:

a)

a

pump

characteristic

curve

for

low

water

level

'X'

(see

Figures

4

and

5),

showing

the

estimated

performance

of

the

pump

or

pumps

under

installed

conditions

at

the

control

valve

'C'

gauge;

b)

the

pump

manufacturer's

data

sheet

showing

the

following:

1)

the

generated

head

graph;

2)

the

power

absorption

graph;

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